UM1360_16 Datasheet, PDF (1/13 Pages) Union Semiconductor, Inc. – Hysteretic Buck High Brightness LED Driver with Internal Switch

UM1360
Hysteretic Buck High Brightness LED Driver with Internal Switch
UM1360Y SOT89-5
General Description
The UM1360 is a PWM step-down converter with internal power switch, designed for driving
single or multiple series connected LEDs efficiently from a voltage source higher than the LED
voltage. The UM1360 can drive up to 10 series connected LEDs. The device operates from an
input supply between 6V and 40V and employs hysteretic control with a high side current sense
resistor to set the constant output current up to 1A. The device is well suited for applications
requiring a wide input range. The high side current sensing and an integrated current sensing
circuitry minimize the number of external components while delivering an accurate average
output current. Depending upon supply voltage and external components, this device can provide
up to 30 watts of output power.
Output current can be adjusted below the set value, by applying an external control signal to the
VSET pin. The VSET pin will accept either a DC voltage or a PWM waveform. Dedicated pulse
width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness
levels. A hysteretic control method ensures excellent input supply rejection and fast response
during load transients and PWM dimming.
Applying a voltage of 0.2V or lower to the VSET pin turns the output off and switches the device
into a low current standby state. The UM1360 employs spread spectrum technique to greatly
reduce its interference to other part of the system.
The UM1360 comes in small SOT89-5 package. It is ideal for industrial and general lighting
applications.
Applications
Features
 Low Voltage Halogen Replacement
LEDs
 Low Voltage Industrial Lighting
 LED Back-Side Lighting
 Illuminated Signs
 DC/DC or AC/DC LED Driver
Application
 General Purpose, Constant Current
Source
 Hysteretic Control with High Side Current
Sensing
 Integrated 40V 0.5Ω NDMOS
 Up to 98% Efficiency
 Wide Input Voltage Range: 6V to 40V
 50V Transient Capability
 ± 5% LED Current Accuracy
 Adjustable Constant LED Current
 Single Pin On/Off and Brightness Control
Using DC Voltage or PWM
 Spread Spectrum Driver
 Over Temperature, Open Circuit LED
Protection
 Up to 1MHz Switching Frequency
 Pb-Free SOT89-5 Package
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http://www.union-ic.com Rev.05 Apr.2016
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